The Witch-King of Angmar is Sauron's second in command and the Leader of the Nine. Once a great Númenórean king, he is now a Ringwraith bound to Sauron. In Edain Mod he is recruited from the Minas Morgul Outpost expansion at the cost of 2000; there you shall gain a veiled Witch-King much like the other Nazgul. When "His Deadliest Servants" is unlocked, he will be able to unveil his identity as the Lord of Minas Morgul.
Veiled Nazgul Edit
Level 1: Mount/Dismount: This allows the Nazgul to Mount/dismount his dark horse
Level 1: Dread Visage: This ability lowers nearby enemy units' damage and armor by 10% and cancels all their eadership bonuses. Enemy heroes also lose 15% damage and armor. For every Nazgul nearby the effect is amplified by an additional 5%. Additionally, he grants nearby Nazgul an increase of 20% in movement speed, 50% in vision range, and 25% damage. (Passive ability)
Level 5: Screech (mounted only): The Nazgul screeches and sends his enemies fleeing in fear.
Level 7: Morgul Corruption: The Nazgul stabs the targeted enemy with a Morgul blade, poisoning them over time. If the unit dies while the effect is active, they will become a Lesser Wraith, which is invisible to enemies but has no attack.
Spellbook power "His Deadliest Servants" (3pp) purchased: Lordship of Minas Morgul: The Nazgul is allowed to claim lordship of Minas Morgul. He gains the ability to ride on his fell beast, improved combat abilities, a fearful mask, and a new set of abilities, fit for his rank. If he falls in combat, this upgrade will need to be repurchased. (cost: 1500)
Level 1: Mount/Fell Beast/Dismount: This allow the Nazgul to Mount/dismount his dark horse and his fell beast.
Level 1: Visage of the Witch-King: This ability lowers nearby enemy units' damage and armor by 10% and cancels all their eadership bonuses. Enemy heroes also lose 15% damage and armor. For every Nazgul nearby the effect is amplified by an additional 5%. Additionally, he grants nearby Nazgul an increase of 20% in movement speed, 50% in vision range, and 25% damage. (Passive ability)
Level 4: Wraith Form (dismounted only): The Nazgul casts off his robes and enters the spirit world. He cannot attack and cannot be attacked and can only cast Terrible Malice. He does retain his Dread Visage ability.
Level 5: Screech (mounted, fellbeast only): The Nazgul screeches and sends his enemies fleeing in fear.
Level 7: Terrible Malice: This ability resets the target enemy's special ability timers to just used.
Level 10: Hour of the Witch-King (dismounted only): The Lord of Minas Morgul raises his sword and sets it aflame. This fires a shock-wave which causes damage and knocks back all enemies. For a short while he also gains a boost in attack damage and attack speed.
In short, the Witch King is Mordor's best hero killer: his Morgul Corruption (before purchasing the Insignia of Minas Morgul upgrade) poisons the enemy, inflicting damage over time, and his Terrible Malice renders all heroes' abilities useless. Once the enemy is crippled and poisoned it is vital to use Hour of the Witch King, which offsets the enemy and grants a major single unit damage boost to the Witch-King. If things get hard you can use Wraith Form for a getaway with the possibility of cursing an enemy hero one last time just before running away.
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